# std::greater

From cppreference.com
< cpp‎ | utility‎ | functional

Defined in header `<functional>` |  |
template< class T > struct greater; |  | (until C++14)
template< class T = void > struct greater; |  | (since C++14)

Function object for performing comparisons. The main template invokes operator> on type `T`.

### Specializations

greater<void> (C++14) | function object implementing x > y deducing parameter and return types (class template specialization)

### Member types

Type | Definition
`result_type` (deprecated in C++17)(removed in C++20) | bool
`first_argument_type` (deprecated in C++17)(removed in C++20) | `T`
`second_argument_type` (deprecated in C++17)(removed in C++20) | `T`

These member types are obtained via publicly inheriting std::binary_function<T, T, bool>. | (until C++11)

### Member functions

operator() | checks whether the first argument is greater than the second (public member function)

## std::greater::operator()

bool operator()( const T& lhs, const T& rhs ) const; |  | (constexpr since C++14)

Checks whether lhs is greater than rhs.

### Parameters

lhs, rhs | - | values to compare

### Return value

lhs > rhs.

If `T` is a pointer type, the result is consistent with the implementation-defined strict total order over pointers.

### Exceptions

May throw implementation-defined exceptions.

### Possible implementation

    constexpr bool operator()(const T& lhs, const T& rhs) const
    {
        return lhs > rhs; // assumes that the implementation handles pointer total order
    }

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 2562 | C++98 | the pointer total order might be inconsistent | guaranteed to be consistent

### See also

less | function object implementing x < y (class template)
ranges::greater (C++20) | constrained function object implementing x > y (class)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/greater&oldid=173633"